RGB cabel problems

[Looke]

Hi
I bought i RGB cabel becouse i want4ed to play my jap games with colour but when i tried it on my tv, it didnt work it was still black and white
the tv is 50hz 110wh.

But after that i tried my jap game with out the RGB cable on another tv and then it worked with all the colours with my original ps2 ---- tv cable that tv were aloso a 50hz

i have tried to change in the ps2 option.. to rgb mode but it was still no colour :\